JPH11257305A - Tournament oil passage constituting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tournament oil passage constituting device which has fast responsiveness and can be downsized. SOLUTION: This device are formed out of a plurality of shuttle valve holes 40a and a connecting grooves 90 continuing to the shuttle valve holes 40a on either one of fitting surfaces of laminated oil passage plates 60 to 67. A shuttle valve 40 is put in the shuttle valve hole 40a, and phase-in oil passages 68, 69 which lead to the shuttle valve hole 40a are formed on both of a oil plate 62 formed with the shuttle valve hole 40a and a oil plate 63 having a fitting surface on the shuttle valve hole 40a side, then, of the pressure oil phased in the both phase-in oil passages 68, 69, a high pressure oil is selected with the shuttle valve to be guided into the connecting groove 90. In this case, this devise comprises a plurality of main passages 51 to 54 which penetrates the plural laminated oil plates and do not intersect each other, and branch grooves 80 to 85 branched off from the main passage, and makes the branch grooves 80 to 85 communicate to the phase-in oil passages 68, 69.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tournament oil path construction device provided with a shuttle valve for selecting a maximum pressure of a circuit.

[0002]

2. Description of the Related Art A conventional apparatus shown in FIG. 3 comprises a pilot valve section 9 for controlling pressure oil of a pilot pump Pp, a control valve section 10 to which a plurality of actuators are connected, and both sections 9, 10
1 to 8 pilot passages 1 to 8 for connecting
It comprises a tournament section x for selecting the maximum pressure of the pilot passages 1 to 8 and a pump control valve 15 for controlling the discharge amount of the main pump Pm. The pilot valve section 9 is connected to a pilot pump Pp, and controls the discharge oil of the pilot pump Pp to supply pilot pressure to the first to eighth pilot passages 1 to 8.

[0003] The control valve section 10 is provided with a neutral passage 19 and a parallel passage 30 in the main pump Pm.
, And comprises first to fourth switching valves 11 to 14 connected via a. Actuators A to D are connected to the first to fourth switching valves 11 to 14, respectively. And these first to fourth
The first to eighth pilot passages 1 to 8 are connected to the pilot chambers 21 to 28 of the switching valves 11 to 14, respectively, so that the pilot pressure from the pilot valve section 9 is guided to the pilot chambers 21 to 28.

The first to fourth switching valves 11 to 14 thus constructed
Holds the illustrated neutral position in the normal state, and discharges the discharge oil of the main pump Pm to the tank T via the neutral passage 19 → the neutral ports 11a to 14a of the first to fourth switching valves → the tank passage 20. . In addition, when the pilot pressure is introduced into any one of the pilot chambers, the switching valve is switched to one of the left and right positions, and the discharge oil of the main pump Pm is supplied from the parallel passage 30 to the actuator via the switching valve.
Then, the return oil of the actuator is transferred to the tank passage 20.
Through the tank T.

[0005] The tournament section x comprises a plurality of shuttle valves, and the shuttle valves constitute a tournament circuit. The first to eighth branch passages 31 to 38 are connected to the tournament section x to guide the pilot pressure in the first to eighth pilot passages 1 to 8. The shuttle valve of the tournament section x selects the highest pressure oil from the pilot pressure thus led and guides it to the pilot chamber 15a of the pump control valve 15. As such a tournament section x,
For example, a structure in which a plurality of poppet type shuttle valves are incorporated into a single block,
In this case, a plurality of plates each having an oil passage and a shuttle valve described in Japanese Patent Application Laid-Open Publication No. H10-15095 are superposed.

On the other hand, an auxiliary pump Ps is connected to the primary pressure port 16 and the supply pressure chamber 15b of the pump control valve 15, and a pump control cylinder 18 is connected to the control port 17. A spring s is provided on the pilot chamber 15a side, and the spring force acts on the spool of the pump control valve 15.

The pump control valve 15 for controlling the discharge amount of the main pump Pm by moving the rod 18a of the pump control cylinder 18 is generated by the pilot pressure guided to the pilot chamber 15a. The spool moves to a position where the thrust, the thrust generated by the discharge pressure from the auxiliary pump Ps led to the supply pressure chamber 15b, and the spring force of the spring s are balanced. The control port 17 communicates with the pump port 16 or the tank port 29 according to the spool switching position. Control port 17 and tank port 2
9 communicates with each other, the pump control cylinder 18 moves leftward in the figure by the spring force of the control spring 39 provided on the rod 18a. Conversely, when the control port 17 communicates with the pump port 16, the discharge oil of the auxiliary pump Ps is supplied to the chamber of the pump control cylinder 18, and the rod 18a moves rightward in the drawing. Then, the discharge amount of the main pump Pm is controlled according to the moving position of the rod 18a.

Next, the operation of the conventional device will be described. For example, when pilot pressure is supplied to the pilot chamber 21 of the first switching valve 11 and the pilot chamber 24 of the second switching valve 12 via the first and fourth pilot passages 1 and 4,
The first switching valve 11 switches to the right switching position in the figure, and the second switching valve 12 switches to the left switching position in the figure. Therefore, the oil discharged from the main pump Pm is
Are supplied to the actuators A and B via the first and second switching valves 11 and 12, respectively. Therefore, the actuator A rotates to one side and the actuator B
Rotate to one or the other.

At this time, the pilot pressure in the first and fourth pilot passages 1 and 4 is guided to the tournament section x via the first and fourth branch passages 31 and 34, respectively. High-pressure oil is selected from these pilot pressures by a shuttle valve, and the high-pressure oil is guided to the pilot chamber 15 a of the pump control valve 15. The pump control valve 15 is
The thrust generated by this pilot pressure and the supply pressure chamber 1
The position is switched to a position where the thrust generated by the discharge pressure of the auxiliary pump Ps led to 5b and the spring force of the spring s are balanced. When the pump control valve 15 is switched, the rod 1 of the pump control cylinder 18 is switched according to the switching position.
8a also moves, and the discharge amount of the main pump Pm is controlled according to the moving position of the rod 18a. Then, the discharge oil of the main pump Pm controlled as described above is supplied to the actuators A and B.

[0010]

The above-mentioned conventional apparatus comprises a first to eighth pilot passages 1 to 8 and a tournament section x for selecting the highest pressure in the first to eighth pilot passages 1 to 8. Since the connection is made via the 1 to 8 branch passages 31 to 38, the volume in the flow path for guiding the pilot pressure is increased by the volume of the first to 8 branch passages 31 to 38. Then, the tournament section x and the pump control valve 15
Also, since they are connected via piping, the volume in the flow path further increases. When the volume in the flow path increases as described above, the responsiveness of the pilot pressure transmitted through the flow path deteriorates. as a result,
There is a problem that the switching response of the pump control valve 15 is deteriorated.

When the volume in the flow path increases, the rise in oil temperature in the flow path also becomes slow. Therefore, it takes a long time for the oil to reach a predetermined temperature at the time of startup, and there is a problem that responsiveness during that time is poor. On the other hand, if the volume in the flow path is large, it is difficult for air to escape, and air may remain when supplying oil to this circuit. If air remains in the flow path as described above, there is also a problem that the pilot pressure cannot be transmitted smoothly. Further, since the tournament section x and the pump control valve 15 are separately provided, there is a problem that the size of the apparatus is increased. An object of the present invention is to provide a tournament oil passage configuration device that has good responsiveness and can be downsized.

[0012]

According to a first aspect of the present invention, a plurality of oil passage plates are overlapped to form a laminated block, and a shuttle valve hole and a shuttle valve hole are provided on the overlapping surface of the oil passage plates. Forming a plurality of continuous connection grooves,
A shuttle valve is incorporated in the shuttle valve hole, and an introduction oil passage leading to the shuttle valve hole is provided in both the oil passage plate having the shuttle valve hole and the oil passage plate having a mating surface on the shuttle valve hole side. In the tournament oil passage configuration device formed and guided to the connection groove by selecting the high-pressure oil among the pressure oils guided to both the introduction oil passages by the shuttle valve, the tournament penetrates the plurality of superposed oil passage plates and does not intersect with each other. A plurality of main passages and a branch groove branched from the main passages are provided, and the branch groove communicates with the introduction oil passage.

A second invention is characterized in that a plurality of branch grooves are branched from one or a plurality of main passages. A third invention comprises a spool slidably incorporated in an oil passage plate, a pilot chamber facing the end of the spool, and a supply pressure chamber for supplying a primary pressure. A connection groove is connected to both or one of the pressure chambers, and the high-pressure oil selected by the shuttle valve is led to the pilot chamber as the switching pressure and to the supply pressure chamber as the signal supply pressure. Features.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in FIGS. 1 and 2, a pilot valve section 9 and a control valve section 10 are connected to first to eighth pilot passages 51 to 51.
At 58, a tournament section is provided between the first to eighth pilot passages 51 to 58. However, since the pilot valve section 9 and the control valve section 10 are the same as those in the above-described conventional example, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted. Here, the tournament section will be mainly described.

As shown in FIG. 1, the first and second pilot passages 51 and 52 are connected via a shuttle valve 40,
The four pilot passages 53 and 54 are connected via the shuttle valve 41. The high-pressure oil selected by the shuttle valves 40 and 41 is guided to the shuttle valve 42. Similarly, the fifth to eighth pilot passages 55 to 58 are connected by the shuttle valves 43 and 44, and the high-pressure oil selected by the shuttle valves 43 and 44 is guided to the shuttle valve 45. Then, the shuttle valve 42 and the shuttle valve 45 are connected via a shuttle valve 46, and the high-pressure oil selected by the shuttle valve 46 is supplied to the pilot chamber 15a of the pump control valve 15.
To the switching pressure. The tournament section composed of the shuttle valves 40 to 46 is a first tournament section.
Tournament Section I. Also, the first to eighth
The pilot passages 51 to 58 correspond to the main passage of the present invention.

On the left side of the first tournament section I in the drawing, second and third tournament sections II and III are shown.
Is provided. The second tournament section II connects the second and fourth pilot passages 52, 54 via a shuttle valve 47. The high-pressure oil selected by the shuttle valve 47 is guided as a switching pressure and a signal supply pressure to a pilot chamber and a supply pressure chamber of a control valve (not shown). In the third tournament section III,
The first and third pilot passages 51 and 53 are connected via a shuttle valve 48, and the sixth and eighth pilot passages 5 and 53 are connected.
6 and 58 are connected via a shuttle valve 49. Then, the high-pressure oil selected by the shuttle valves 48 and 49 is guided to the shuttle valve 50, and the high-pressure oil selected by the shuttle valve 50 is also transferred to the pilot chamber and the supply pressure chamber of the control valve (not shown) by the switching pressure and the supply pressure, respectively. Leading as signal supply pressure.

FIG. 2 is a cross-sectional view of the laminated block V, specifically showing a portion V surrounded by a two-dot chain line in FIG.
And in this sectional view, a part of the first tournament section I, the second tournament section II,
Only the pump control valve 15 is shown, and the same components as those in FIG. 1 are denoted by the same reference numerals. The laminated block V is formed by fixing a plurality of oil passage plates 60 to 67 with bolts (not shown), and the oil passage plates 60 to 67 are formed with grooves or holes by cutting or die casting. When the oil passage plates 60 to 67 are overlapped, first to fourth pilot passages 51 to 54 penetrating from the upper side to the lower side in the drawing are formed. These first
Although the pilot passages 51 to 54 are formed in a straight line in this embodiment, they may be formed in a winding shape. However, when the pilot paths cross each other, they must not communicate with each other.

In the laminated block V, shuttle valve holes 40a to 42a, 46a and 47a are formed.
Shuttle valves 40 to 42, 46, 4
7 is incorporated. An introduction oil passage 68 formed in the oil passage plate 62 and an introduction oil passage 69 formed in the oil passage plate 63 communicate with the shuttle valve hole 40a. The first pilot passage 51 is provided in the introduction oil passage 68.
A branch groove 80 branched from the second pilot passage 52 is connected to the introduction oil passage 69. The oil passage plate 6 is provided in the shuttle valve hole 41a.
The introduction oil passage 70 formed in the oil passage plate 65 and the introduction oil passage 71 formed in the oil passage plate 65 are connected to each other. A branch groove 82 branched from the third pilot passage 53 is connected to the introduction oil passage 70, and a branch groove 83 branched from the fourth pilot passage 54 is connected to the introduction oil passage 71.

In the shuttle valve holes 40a and 41a, the connection grooves 9 for guiding the high-pressure oil selected by the shuttle valves 40 and 41 are provided.
0 and 91 are respectively connected. These connection grooves 90 and 91 are connected to the shuttle valve hole 42a via the introduction oil passages 72 and 73, respectively. Further, a connection groove 92 for guiding the high-pressure oil selected by the shuttle valve 42 is connected to the shuttle valve hole 42a, and the connection groove 92 is connected to the shuttle valve hole 4 via a communication passage 59 formed in the oil passage plate 64.
6a. And this shuttle valve hole 46a
, The highest pilot pressure in the fifth to eighth pilot passages 55 to 58 (not shown) is guided through the connection groove 93 and the introduction oil passage 74. With the above configuration, the first tournament section I is configured.

The shuttle valve hole 47a has an introduction oil passage 75 communicating with a branch groove 84 branched from the second pilot passage 52 and an introduction oil passage 76 communicating with a branch groove 85 branched from the fourth pilot passage 64. Are connected to each other, and these configurations constitute the second tournament section II shown in FIG. On the other hand, in the oil passage plate 65,
A spool hole 78 is formed, and a spool 79 is slidably incorporated therein. By closing one end of the spool hole 78 with the cap 86, the pilot chamber 15 is closed.
a. A spring S is provided in the pilot chamber 15a, and high-pressure oil selected by the shuttle valve 46a is guided through the connection groove 94 and the oil passage 77.

The primary pressure ports 87, 16, the control port 17, and the tank port 29 are communicated with the spool hole 78 in order from the left in the figure. And primary pressure port 8
An auxiliary pump Ps is connected to 7, 16 and the pressure oil of the auxiliary pump Ps is supplied as a signal supply pressure. The pump control cylinder 18 shown in FIG. 2 is connected to the control port 17, and the tank T is connected to the tank port 29 via a tank passage 30. With such a configuration,
The pump control valve 15 shown in FIG. 1 is configured. And
The pump control valve 15 supplies the pressure oil of the auxiliary pump Ps to the pump control cylinder 18 or discharges the return oil from the pump control cylinder 18 to the tank T according to the switching position of the spool 79. I do.

Reference numeral J indicates a threaded portion for connecting the joint, and reference numeral G indicates a seal member for preventing leakage of pressure oil from the mating surface of the oil passage plate. Further, the primary pressure ports 87 and 16 and the supply pressure chamber 15b in this embodiment are
This corresponds to the supply pressure chamber of the present invention. Although only a part of the circuit shown in FIG. 1 is shown in the cross-sectional view of FIG. 2, the laminated block V also includes fifth to eighth pilot passages 55 to 58 and other tournament sections. . The spool of the control valve that guides the maximum pressure of each tournament section is also incorporated in the laminated block V.

According to this embodiment, the first to eighth pilot passages 51 to 58 are provided in the laminated block V.
3 tournament sections I to III and pump control valve 15
, The first to eighth pilot passages 51 to 58 and the first to third tournament sections I to III.
And the piping connecting the first to third tournament sections I to III and the pump control valve 15 do not need to be specially provided unlike the conventional example. Since there is no need to provide a special pipe, the volume in the flow path can be reduced, and the switching response of the pump control valve 15 can be improved. Further, since the tournament section and the pump control valve 15 are also incorporated in the laminated block V constituting the pilot passage, not only can the device be miniaturized, but also extra piping can be reduced and cost can be reduced.

Further, by branching a plurality of branch grooves from one pilot passage, a plurality of tournament sections can be formed in one laminated block V. If the control valve for supplying the high-pressure oil selected in each tournament section is also incorporated in the laminated block V, higher responsiveness can be obtained. In this embodiment, the high pressure oil selected in the tournament section is used as the pilot pressure.
Instead of s, the high pressure oil selected in the tournament section may be led to the primary pressure ports 16 and 87 and used as the primary pressure.

[0025]

According to the first aspect of the present invention, a special piping is not required by forming a tournament oil passage in a laminated block having a main passage.
Therefore, the volume in the flow path can be reduced by the amount of the pipe, and the response of the pilot pressure can be improved. In addition, product costs can be reduced by eliminating piping. According to the second invention, a plurality of tournament oil passages can be formed in the laminated block by branching the plurality of branch grooves from one main passage. According to the third aspect, the spool of the control valve that guides the high-pressure oil selected by the shuttle valve can also be provided in the laminated block, so that the switching response of the control valve can be further improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing the entire device of the present invention.

FIG. 2 is a sectional view of a laminated block according to the present invention.

FIG. 3 is a circuit diagram of a conventional device.

[Explanation of symbols]

15a Pilot chamber 15b Supply pressure chamber 16, 87 Primary pressure port 40-50 Shuttle valve 40a-42a Shuttle valve hole 46a, 47a Shuttle valve hole 51-58 that constitutes the supply pressure chamber of the present invention Constructs the main passage of the present invention First
８8 pilot passage 60 ６７67 oil passage plate 68 ７６76 introduction oil passage 79 spool 80 ８５85 branch groove 90 ９４94 connection groove V laminated block

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Genroku Sugiyama 650, Katemachi, Tsuchiura-shi, Ibaraki Pref.Hitachi Construction Machinery Co., Ltd. ) Inventor Norio Onuma 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Kogyo Co., Ltd. (72) Inventor Ikuo Inagaki 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Kogyo In-house (72) Inventor Masao Kashiwagi 2-4-1 Hamamatsucho, Minato-ku, Tokyo World Trade Center Building Kayaba Industry Co., Ltd.

Claims (3)

[Claims] 1. A lamination block comprising a plurality of oil passage plates superposed on each other, a plurality of shuttle valve holes and a plurality of connection grooves continuous with the shuttle valve holes are formed on a superposed surface of the oil passage plates, A shuttle valve is incorporated in the shuttle valve hole, and an introduction oil passage leading to the shuttle valve hole is provided in both the oil passage plate having the shuttle valve hole and the oil passage plate having a mating surface on the shuttle valve hole side. In the tournament oil passage configuration device formed and guided to the connection groove by selecting the high-pressure oil among the pressure oils guided to both the introduction oil passages by the shuttle valve, the tournament penetrates the plurality of superposed oil passage plates and does not intersect with each other. A tournament oil passage configuration device, comprising: a plurality of main passages; and a branch groove branched from the main passages, wherein the branch groove communicates with the introduction oil passage. 2. The tournament oil passage construction device according to claim 1, wherein a plurality of branch grooves are branched from one or a plurality of main passages. 3. A pilot chamber having a spool slidably incorporated in an oil passage plate, a pilot chamber facing an end of the spool, and a supply pressure chamber for supplying a primary pressure. A connection groove is connected to both or one of the chambers, and high-pressure oil selected by the shuttle valve is led to the pilot chamber as switching pressure and to the supply pressure chamber as signal supply pressure. Claim 1 or 2
The tournament oilway configuration device according to the above.